From a1383655cfaa71609d6236ae0fcf3b6047462b98 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= Date: Sat, 29 Feb 2020 09:25:20 +0100 Subject: bcm27xx: add linux 5.4 support MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Tested on bcm2710 (Raspberry Pi 3B). Signed-off-by: Álvaro Fernández Rojas --- ...rng-Avoid-initialising-if-already-enabled.patch | 25 ++++++++++++++++++++++ 1 file changed, 25 insertions(+) create mode 100644 target/linux/bcm27xx/patches-5.4/950-0019-bcm2835-rng-Avoid-initialising-if-already-enabled.patch (limited to 'target/linux/bcm27xx/patches-5.4/950-0019-bcm2835-rng-Avoid-initialising-if-already-enabled.patch') diff --git a/target/linux/bcm27xx/patches-5.4/950-0019-bcm2835-rng-Avoid-initialising-if-already-enabled.patch b/target/linux/bcm27xx/patches-5.4/950-0019-bcm2835-rng-Avoid-initialising-if-already-enabled.patch new file mode 100644 index 0000000000..76b8bb79da --- /dev/null +++ b/target/linux/bcm27xx/patches-5.4/950-0019-bcm2835-rng-Avoid-initialising-if-already-enabled.patch @@ -0,0 +1,25 @@ +From 5cf8059baa23779d979bcd8febe5ed4670e58fe3 Mon Sep 17 00:00:00 2001 +From: popcornmix +Date: Tue, 6 Dec 2016 17:05:39 +0000 +Subject: [PATCH] bcm2835-rng: Avoid initialising if already enabled + +Avoids the 0x40000 cycles of warmup again if firmware has already used it +--- + drivers/char/hw_random/bcm2835-rng.c | 6 ++++-- + 1 file changed, 4 insertions(+), 2 deletions(-) + +--- a/drivers/char/hw_random/bcm2835-rng.c ++++ b/drivers/char/hw_random/bcm2835-rng.c +@@ -102,8 +102,10 @@ static int bcm2835_rng_init(struct hwrng + } + + /* set warm-up count & enable */ +- rng_writel(priv, RNG_WARMUP_COUNT, RNG_STATUS); +- rng_writel(priv, RNG_RBGEN, RNG_CTRL); ++ if (!(rng_readl(priv, RNG_CTRL) & RNG_RBGEN)) { ++ rng_writel(priv, RNG_WARMUP_COUNT, RNG_STATUS); ++ rng_writel(priv, RNG_RBGEN, RNG_CTRL); ++ } + + return ret; + } -- cgit v1.2.3